JP2016166756A - Instrument for porous material quality evaluation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instrument for porous material quality evaluation capable of performing nondestructive quality evaluation of a porous material, such as concrete and mortar.SOLUTION: The instrument for porous material quality evaluation includes: a front plate 1 having a first opening 2 formed therein; a back plate 4 having a second opening 5 formed therein; and a side plate 11 coupling the front plate 1 to the back plate 4 in parallel with a gap opened therebetween; and a plurality of leg parts 13 provided on an outer surface of a surface side of the back plate 4 to form a gap between the back plate 4 and the surface of an evaluation object portion. The second opening 5 is formed by being divided into two upper and lower stages with an interval opened, both of a lower edge of an opening 6 of the upper stage and an upper edge of an opening 7 of the lower stage, are formed in the shape of a convex circular arc, guide means 9 for draining and guide means 10 for holding, for guiding the flow of water attached to an inner face of the back plate 4, are formed in the inner face of the back plate 4, and a cup attached to an injector for restricting a water injection region is attached to the first opening 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a porous material quality evaluation device, particularly a porous material used when performing non-destructive quality evaluation of a porous material such as concrete and mortar quickly and easily without limitation of the application site. The present invention relates to a material quality evaluation instrument.

  In concrete, which is a major structural material in the civil engineering and construction fields, conventionally, compressive strength obtained by compressive fracture tests has been considered as an index representing the quality of concrete, and quality evaluation or quality control based on compressive strength has been made. In addition, the quality of concrete in terms of durability has been qualitatively estimated from information such as the blending of materials at the time of concrete production, for example, the water-cement ratio, which is the mixing ratio of water and cement.

  However, in concrete structures that have actually been constructed and hardened, there are no problems with compressive strength, blending, etc., but due to insufficient compactness, deterioration factors such as carbon dioxide and salinity Intrusions faster than expected and deteriorate early, resulting in many cases in which the durability of concrete decreases.

  Thus, despite the fact that the compressive strength and water-cement ratio of concrete are important design indicators for structural materials, what are the evaluation indicators for considering the durability of concrete, such as resistance to material deterioration? Does not necessarily match. Therefore, not only information such as compressive strength and blending but also evaluation of the quality of concrete in terms of durability is required. In particular, the establishment of a method that can easily and reliably evaluate the durability of actual structures quickly and easily without any restrictions on the application site is strongly required in all aspects of structure design, construction and maintenance. Has been.

JP 2012-26883 A JP 2012-78194 A

  What is considered as an index having a great influence on the durability of concrete is resistance to movement of various substances such as carbon dioxide, chloride ions, and water. This resistance is generally evaluated based on such concepts as gas permeability, water permeability / water absorption, chloride ion diffusion and neutralization rate.

  However, when these evaluations are performed on actual concrete, the method of damaging the actual structure, such as taking a core specimen as a test sample, is costly, external, and structural. In most cases, implementation is restricted for reasons.

  Therefore, a method for nondestructive evaluation of concrete quality by air permeability and water permeability / water absorption has been proposed. However, as will be described later, each method requires a large-scale power supply facility.For example, preparation and execution of inspection require labor, and interpretation of evaluation values obtained by each method requires expertise. There is a problem. For this reason, these nondestructive inspection methods are rarely used in practical sites that actually require inspection of structures.

  The above-described problems of nondestructive inspection of concrete will be further described.

  In the air permeability test, a suction cup or the like is installed on the concrete measurement surface, and the pressure in the cup is reduced to forcibly move the air in the concrete, thereby evaluating the density of the concrete structure. This test includes a method proposed outside the country, in which a sample is taken in a laboratory, and a method in which an actual structure is measured by a method called a torrent method.

  However, since the substance to be moved is air, it is theoretically difficult to control the air movement range. In addition, since the influence range is invisible, there are many error factors. In addition, this measurement requires expertise and lacks versatility. In addition, there are variations due to the presence of cracks in the concrete surface and the influence of the moisture state inside. In addition, there are many practical problems such as the time required for preparation for warm-up operation or the like due to the device configuration. In addition, although the device is commercially available, it is very expensive at several million yen, so it cannot be easily introduced as an inspection device. Furthermore, since measuring instruments cannot be operated with a small battery, it is necessary to use them together with a generator or the like in an inspection work outdoors. For this reason, the change or movement of the measurement location is restricted, and it is necessary to perform the measurement preparation work again every time the change or movement is made. For these reasons, it is difficult to apply the air permeability test to the inspection of a structure.

  The water permeability / water absorption test is a method in which water is passed through concrete, and a method of collecting a sample in a laboratory and a simple water absorption test method applicable to the field are proposed.

  However, these tests, like the air permeability test, are affected by cracks and internal moisture, so there is a problem in measurement accuracy. In addition, the act of supplying water to be absorbed into concrete, which is the basis of the test method, is a special work, and in order to carry out the work stably, accumulation of skill and know-how is required. Further, as with the air permeability test, the apparatus is expensive and cannot be easily introduced as an inspection device. In addition, in the field application type simple water absorption test method, it takes time to install the measuring device and the like. Therefore, several tens of minutes are required for only one preparation time, and there are many practical problems. Furthermore, since measuring instruments cannot be operated with a small battery, it is necessary to use them together with a generator or the like in an inspection work outdoors. For this reason, the change or movement of the measurement location is restricted, and it is necessary to perform the measurement preparation work again every time the change or movement is made. For these reasons, it is difficult to apply the water permeability / water absorption test to the inspection of structures.

  As described above, the method of nondestructive concrete quality evaluation by air permeability and water permeability / water absorption is inferior in mobility in measurement work, so it is difficult to apply it to the practice of inspection. In fact, this method has not yet spread.

  For this reason, the quality evaluation and management of concrete in actual structures is currently limited to the quality index based on the compressive strength obtained by destructive testing of cylindrical specimens prepared at the same time as construction. is there.

  Patent Document 1 discloses a method in which an identification material is applied to the surface of a porous material and the denseness is evaluated by the color of the surface. In other words, the evaluation method disclosed in Patent Document 1 measures the color characteristics of the porous material before the liquid absorption treatment, determines the reference value, performs the liquid absorption treatment that causes the porous material to absorb the liquid, The color characteristic of the porous material after treatment is measured to determine a liquid absorption treatment value, a characteristic value as a difference between the reference value and the liquid absorption treatment value is determined, and the porous material is based on the characteristic value The liquid containing state is determined.

  In Patent Document 2, the color characteristic of the porous material before the liquid absorption treatment is measured to determine a reference value, the liquid absorption treatment for absorbing the liquid into the porous material is performed, and the porous material after the liquid absorption treatment is performed. Measure the color characteristics of the material to determine the liquid absorption treatment value, determine the characteristic value as the difference between the reference value and the liquid absorption treatment value, and determine the liquid content of the porous material based on the characteristic value A method for evaluating the liquid content of a porous material to be determined is disclosed.

  However, according to these methods, porous materials having a large quality difference can be distinguished from each other, but porous materials having a small quality difference can be quickly and easily and reliably performed without restriction on the application place. There wasn't.

  In view of this, a quality evaluation method for porous materials has been devised, which enables nondestructive quality evaluation of porous materials such as concrete and mortar to be performed quickly and easily without any restriction on the application location.

  In this evaluation method, a liquid discriminating material such as water or the like is applied to the surface of an evaluation target portion of a porous material such as concrete or mortar by jetting, and the liquid discriminating material flows out without being absorbed by the porous material. Is determined, and the quality of the porous material is determined based on the application status.

  Here, the application status refers to (a) the number of repeated application of the liquid identification material, (b) the flow start time as the elapsed time from the application of the liquid identification material until the liquid identification material flows without being absorbed, and (c) the liquid Absorption status of the liquid identification material on the surface of the porous material to which the identification material has been applied, (d) the flow distance of the liquid identification material between the lower edge of the upper opening and the upper edge of the lower opening (the flow distance will be described later) The absorption state detection means is a color meter, gloss meter, color difference meter or spectroscope detector, digital camera, image processing of a video captured by a digital video camera, or visual observation. .

  According to this evaluation method, quality evaluation by nondestructiveness of a porous material such as concrete and mortar can be performed quickly and easily and reliably without limitation of the application location.

  However, when liquid identification material such as water is sprayed onto the surface of the evaluation target part such as concrete with a spraying tool such as a spray, the liquid identification material is always applied under the same conditions even if the evaluation target part changes. It is necessary to be able to inject towards.

  As one of the methods of injecting with the injection tool, a method of injecting the liquid identification material toward the surface of the evaluation target part from a place away from the evaluation target part by a predetermined distance from the evaluation target part can be considered.

  However, this method has the following problems.

  (1) While measuring the distance between the injection tool and the evaluation target part, it is necessary to always keep it constant, but since the liquid identification material is injected by holding the injection tool by hand, It is difficult to keep the distance to the surface constant during the measurement.

  (2) While measuring the spray angle of the liquid discriminating material from the jetting tool, it is necessary to keep it constant at all times, but since the liquid discriminating material is jetted by holding the jetting tool by hand, the jetting angle of the liquid discriminating material is measured. It is difficult to keep it constant at all times.

  (3) When detecting the absorption state of the liquid identification material on the surface of the evaluation target part with a detector, the detector is accurately placed toward the surface of the evaluation target part, and the detector and the surface of the evaluation target part It is necessary to always maintain a constant distance during measurement, but when detecting by holding the detector by hand, the detector should be accurately placed facing the surface of the evaluation target part, and the detection Since it is difficult to always keep the distance between the measuring device and the surface of the evaluation target part constant during measurement, the absorption state cannot be accurately detected by the detector.

  Therefore, the object of the present invention is to apply a liquid identification material to the surface of the evaluation target portion of the porous material by jetting and grasp the application state of the liquid identification material until the liquid identification material flows without being absorbed by the porous material. In the porous material quality evaluation device used when determining the quality of the porous material based on the application status, the distance between the injection tool and the surface of the evaluation target portion and the injection of the liquid identification material During measurement, the angle can be kept constant at all times, and a detector that detects the absorption status of the liquid identification material on the surface of the evaluation target part can be accurately set toward the surface of the evaluation target part. An object of the present invention is to provide an apparatus for evaluating the quality of a porous material, which can always be kept constant during measurement of the distance between the detector and the surface of the evaluation target site.

  The present invention has been made to achieve the above object, and is characterized by the following.

  According to the first aspect of the present invention, the liquid identification material is applied to the surface of the evaluation target portion of the porous material by jetting, and the liquid identification material until the liquid identification material flows out without being absorbed by the porous material. A circular ring-shaped front plate in which a first opening is formed in a device for evaluating the quality of a porous material, which is used when determining the quality of the porous material based on the status of the application. A circular back plate having a second opening formed therein, a cylindrical side plate connecting the front plate and the back plate in parallel with a space therebetween, and the evaluation target portion of the back plate. A plurality of legs provided on the outer surface of the front surface side to form a gap between the back plate and the surface of the evaluation target part, and the second opening has two upper and lower steps spaced apart from each other. The lower edge of the upper opening and the upper edge of the lower opening are Both are formed in a downward convex arc shape, and guide means for guiding the flow of the liquid identification material attached to the inner surface of the back plate is formed on the inner surface of the back plate, and the first opening has The cup attached to the injection tool is applied to restrict the injection area of the liquid identification material.

  According to a second aspect of the present invention, in the first aspect of the present invention, the application status is determined by the number of repeated application of the liquid identification material, from the application of the liquid identification material until the liquid identification material flows without being absorbed. The flow start time as the elapsed time, the absorption state of the liquid identification material on the surface of the porous material to which the liquid identification material is applied, or the lower edge of the upper opening and the upper edge of the lower opening It is characterized in that it is the flow-down distance of the liquid discriminating material.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the guide means comprises discharge guide means formed on the inner surface of the back plate in a convex arc shape, The discharge guide means guides the flow of the liquid identification material adhering to the inner surface of the back plate and discharges the liquid identification material out of the second opening. Thus, the liquid identification material enters the second opening. It is characterized by preventing the flow down.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the discharge guide means includes the back plate at the upper edge portion of the upper stage opening, and the gap between the upper stage opening and the lower stage opening. It is characterized by being formed on the back plate.

  The invention according to claim 5 is the invention according to claim 1 or 2, wherein the guide means comprises holding guide means formed in a downwardly convex arc shape on the inner surface of the back plate, The holding guide means is characterized by holding the liquid identification material and thus preventing the liquid identification material from flowing into the second opening.

  The invention described in claim 6 is characterized in that, in the invention described in claim 5, the holding guide means is formed on the back plate of the upper edge portion of the lower opening.

  A seventh aspect of the invention is characterized in that, in the invention according to any one of the first to sixth aspects, the guide means comprises a protrusion.

  The invention described in claim 8 is characterized in that, in the invention described in any one of claims 1 to 6, the guide means comprises a groove.

  The invention according to claim 9 is characterized in that, in the invention according to any one of claims 1 to 8, a drain hole is formed in an upper portion of the side plate.

  The invention according to claim 10 is characterized in that, in the invention according to any one of claims 1 to 9, a positioning ring of the cup is provided on a front surface of the front plate. is there.

  The invention according to claim 11 is characterized in that, in the invention according to any one of claims 1 to 10, a corner portion of the front plate and the side plate is formed in a curved surface shape. Is.

  The invention according to claim 12 is the invention according to any one of claims 1 to 11, wherein the back plate is provided with a marking portion in which a plurality of holes into which tips of writing instruments are inserted are formed. It is characterized by being.

  According to the present invention, the distance between the injection tool and the surface of the evaluation target part and the injection angle of the liquid identification material can be always kept constant during measurement, and the liquid identification material on the surface of the evaluation target part can be maintained. The detector that detects the absorption status of the substance can be accurately placed toward the surface of the evaluation target part, and the distance between the detector and the surface of the evaluation target part can always be kept constant during measurement. it can.

  In addition, according to the present invention, the second opening is formed in two upper and lower stages with an interval, so that the liquid identification material from the upper opening is less likely to flow out due to bubbles or the like generated on the upper surface of the evaluation target site. However, since the flow of the liquid identification material from the lower opening can be confirmed, it is possible to accurately determine whether or not the liquid identification material has flowed out. Moreover, this effect is achieved by forming the lower edge of the upper stage opening and the upper edge of the lower stage opening in a downwardly convex arc shape so that the liquid identification material can easily flow in the center. It is possible to accurately determine the presence or absence of flow.

  Further, according to the present invention, by setting the distance between the lower edge of the upper stage opening and the upper edge of the lower stage opening to an arbitrary distance, the determination based on the flow distance of the liquid discriminating material flowing down from the upper stage opening can be easily performed. It becomes possible.

  Further, according to the present invention, by forming the guide means for guiding the flow of the liquid identification material adhering to the inner surface of the back plate on the inner surface of the back plate, the excess liquid identification material can be evaluated by the porous material. It is possible to reliably avoid measurement errors caused by the contact with the surface.

  Further, according to the present invention, by forming a drain hole in the upper part of the side plate, the liquid identification material accumulated in the quality evaluation instrument can be easily and reliably excluded from the instrument. When evaluating the evaluation target part, it is possible to reliably avoid an adverse effect on the evaluation by the liquid discriminating material remaining in the instrument.

  Further, according to the present invention, the cup can be accurately applied to the first opening of the front plate by providing the cup positioning ring on the front plate, so that the liquid identification material from the injection tool can be accurately evaluated. It can be sprayed onto the surface of the target site.

  Further, according to the present invention, the quality evaluation device is held by hand and pressed against the surface of the evaluation target portion of the porous material, but the corner portion between the front plate and the side plate of the quality evaluation device is curved. By forming it, it is easy to have a quality evaluation instrument, feel good, and operate easily. Moreover, it is possible to easily wipe off the water in the quality evaluation instrument.

  Moreover, according to this invention, a measurement position can be accurately marked by providing the back plate with the marking part in which the several hole in which a writing instrument is inserted was formed.

It is the perspective view which looked at the instrument for quality evaluation of the porous material of this invention from the front side. It is the perspective view which looked at the instrument for quality evaluation of the porous material of this invention from the back side. It is a front view which shows the instrument for quality evaluation of the porous material of this invention. It is a rear view which shows the instrument for quality evaluation of the porous material of this invention. It is a side view which shows the instrument for quality evaluation of the porous material of this invention. It is a top view which shows the instrument for quality evaluation of the porous material of this invention. It is a bottom view which shows the instrument for quality evaluation of the porous material of this invention. It is a vertical sectional view showing an instrument for evaluating the quality of a porous material according to the present invention. It is the sectional view on the AA line of FIG. It is sectional drawing which shows the instrument for quality evaluation of the porous material of this invention to which the cup of the injection tool was applied. It is sectional drawing which shows the instrument for quality evaluation of the porous material of this invention to which the detector was applied.

  An embodiment of a quality evaluation device for porous material according to the present invention will be described with reference to the drawings.

  In addition, although the instrument demonstrated below is used in the case of quality evaluation of the porous material in case a porous material is concrete and a liquid identification material is water, it is not limited to these.

  FIG. 1 is a perspective view of a porous material quality evaluation device according to the present invention as viewed from the front side, and FIG. 2 is a perspective view of the porous material quality evaluation device as viewed from the back side according to the present invention. 3 is a front view showing a device for evaluating the quality of a porous material according to the present invention, FIG. 4 is a rear view showing the device for evaluating the quality of a porous material according to the present invention, and FIG. 6 is a side view showing a porous material quality evaluation device, FIG. 6 is a plan view showing a porous material quality evaluation device of the present invention, and FIG. 7 is a porous material quality evaluation device of the present invention. FIG.

  1 to 7, reference numeral 1 denotes a circular ring-shaped front plate in which a circular first opening 2 is formed. On the front surface of the front plate 1, a cup positioning ring 3 (described later) attached to a sprayer (spray) (described later) is provided coaxially with the first opening 2. By providing the positioning ring 3, the cup can be accurately applied to the first opening 2 of the front plate 1 (see FIG. 10).

  4 is a back plate in which the second opening 5 is formed. The 2nd opening 5 restrict | limits the injection area | region of the water injected to the surface (S) (refer FIG. 10) of an evaluation object site | part from an injection tool. The second opening 5 is formed by dividing the upper stage opening 6 and the lower stage opening 7 into two upper and lower stages with a space therebetween. The upper edge 6a of the upper stage opening 6 is formed in an upward convex arc shape, and the lower edge 6b of the upper stage opening 6 is formed in an upward convex arc shape. The upper edge 7a of the lower stage opening 7 is formed in a downward convex arc shape, and the lower edge 7b of the lower stage opening 7 is formed in a downward convex arc shape. The curvatures of the upper edge 6a of the upper stage opening 6 and the lower edge 7b of the lower stage opening 7 are the same.

  By forming the second opening 5 in such a shape, even when water from the upper stage opening 6 is difficult to flow out due to bubbles or the like generated on the upper surface (S) of the evaluation target site, Since the flow of water can be confirmed, the presence or absence of water flow can be accurately determined. In addition, by forming the lower edge 6b of the upper stage opening 6 and the upper edge 7a of the lower stage opening 7 in a downwardly convex circular arc shape, water can be easily collected in the center and flowed. It can be judged accurately.

  The relationship between the size of the first opening 2 and the second opening 5 is detected when the water absorption state on the surface (S) of the evaluation target part sprayed with water is measured by the detector 17 such as a colorimeter. The diameter is the same as the vessel 17. Thus, by inserting the detector 17 into the first opening 2 and the second opening 5, the detector 17 can be stably set on the instrument (see FIG. 11).

  On the inner surface of the back plate 4, guide means 8 for guiding the flow of water attached to the inner surface of the back plate 4 is formed. The guide means 8 includes a discharge guide means 9 formed in an upward convex arc shape and a holding guide means 10 formed in a downward convex arc shape. It is made up of.

  One discharge guide means 9 is formed on the back plate 4 at the upper edge 6 a of the upper opening 6, and two discharge guide means 9 are formed on the back plate 4 between the upper opening 6 and the lower opening 7. One holding guide means 10 is formed on the back plate 4 of the upper edge portion of the lower opening 7. In addition, the number of each guide means 9 and 10 is not limited.

  The discharge guide means 9 formed on the back plate 4 of the upper edge 6a portion of the upper opening 6 guides the flow of water adhering to the back plate 4 of the upper edge 6a portion of the upper opening 6 so that the upper stage of the adhering water. It has a function of preventing flow down into the opening 6.

  The discharge guide means 9 formed on the back plate 4 between the upper stage opening 6 and the lower stage opening 7 guides the flow of water adhering to the back plate 4 between the upper stage opening 6 and the lower stage opening 7, It has a function of blocking the flow of the adhering water into the lower opening 7.

  By these functions, it is possible to reliably avoid measurement errors caused by excess water on the surface (S) of the evaluation target portion of the porous material.

  The holding guide means 10 has a function of holding water adhering to the inner surface of the back plate 4 between the upper stage opening 6 and the lower stage opening 7, and thus preventing the water from flowing into the lower stage opening 7. ing. With this function, it is possible to reliably avoid measurement errors caused by excess water on the surface (S) of the evaluation target portion of the porous material.

  Even if the guide means 8 is formed by a groove, the same effect as in the case of the protrusion described above can be obtained.

  Reference numeral 11 denotes a cylindrical side plate that connects the front plate 1 and the back plate 4 in parallel with a gap therebetween. A drain hole 12 is formed in the upper part of the side plate 11. By forming the drain hole 12, when the next evaluation target site is evaluated, water accumulated in the instrument can be easily and reliably removed outside the instrument, so that the remaining water in the instrument is It is possible to reliably avoid adversely affecting the evaluation of

  Corner portions of the front plate 1 and the side plate 11 are formed in a curved surface shape. This makes it easy to hold a quality evaluation instrument by hand, has a good feel and is easy to operate. Moreover, it is possible to easily wipe off the water in the quality evaluation instrument.

  Reference numeral 13 denotes a plurality of (four in this example) leg portions provided on the outer surface of the back plate on the surface (S) side of the evaluation target portion, and the back plate 4 and the surface (S) of the evaluation target portion A gap (L) is formed between the two. The reason for forming this gap (L) is that it does not hinder the flow of water sprayed onto the surface (S) of the evaluation target site.

  Reference numeral 14 denotes a water injection tool, and a cone-shaped cup 15 is attached to the injection portion (see FIG. 10). The cup 15 restricts the water injection region from the injection tool 14, and the shape thereof may be a dome shape in addition to the cone shape.

  Reference numeral 16 denotes a marking portion provided on the top of the back plate 4. A plurality (two in this example) of holes 16a are formed in the marking portion 16 into which the tip of a writing instrument (not shown) is inserted. By inserting the tip of the writing instrument into the hole 16a and marking the surface (S) of the evaluation target region, the measurement position can be accurately marked. Since there are a plurality of marking locations, the measurement location is unlikely to shift. As a result, measurement at a plurality of locations can be performed in parallel with one quality evaluation instrument. Furthermore, marking can be easily performed by forming the hole 16a into a tapered shape.

  In order to determine the quality of concrete using the quality evaluation device of the present invention described above, the quality evaluation device is held by hand, and the legs 13 are formed on the surface (S) of the evaluation target region as shown in FIG. Is pressed to hold the instrument in place, the tip of the cup 15 attached to the injector 14 is fitted into the positioning ring 3, and water from the injector 14 is applied to the surface (S) of the site to be evaluated. Spray.

  And the water grant condition until water flows out without being absorbed by concrete is grasped, and the quality of concrete is determined based on the grant situation. That is, the number of repeated application of water, the flow start time as the elapsed time from the application of water until the water flows out without being absorbed, or the surface (S) of the evaluation target part of the concrete to which water has been applied The state of water absorption is detected by the detector 17 to determine the quality of the concrete.

  As described above, according to the present invention, by applying the cup 15 of the injection tool 14 to the front plate 1, the distance between the injection tool 14 and the surface (S) of the evaluation target site and water The injection angle can always be kept constant during the measurement, and the detector 17 for detecting the water absorption state on the surface (S) of the evaluation target portion is accurately directed toward the surface (S) of the evaluation target portion. It can be installed and can always be kept constant during measurement of the distance between the detector 17 and the surface (S) of the site to be evaluated. As a result, the quality of the porous material can be accurately evaluated.

  In addition, according to the present invention, the second opening 5 is formed in two upper and lower stages at intervals, so that the water from the upper stage opening 6 does not easily flow out due to bubbles or the like generated on the surface (S) of the site to be evaluated. Even in this case, since the flow of water from the lower stage opening 7 can be confirmed, the presence or absence of the flow of water can be accurately determined. In addition, this effect is achieved by forming the lower edge 6b of the upper stage opening 6 and the upper edge 7a of the lower stage opening 7 in a downwardly convex arc shape, so that the water can easily gather and flow in the center. It is possible to accurately determine the presence or absence of flow.

  Further, according to the present invention, by setting the distance between the lower edge of the upper stage opening and the upper edge of the lower stage opening to an arbitrary distance, it is possible to easily determine based on the flow distance of the water that has flowed from the upper stage opening. Become.

  For example, when evaluating a porous material based on whether or not the water flow distance reaches 20 mm, a back plate is used in which the distance between the lower edge of the upper opening and the upper edge of the lower opening is set to 20 mm. What is necessary is just to detect visually whether the water which flowed down from the bottom reaches a lower stage opening. Moreover, it is also possible to obtain a detailed flow-down distance by providing a scale on the transparent back plate in advance.

  Moreover, according to this invention, the guide means 8 which guides the flow of the water adhering to the inner surface of the back plate 4 is formed on the inner surface of the back plate 4, so that excess water can be removed from the evaluation target portion of the porous material. Measurement errors due to the surface (S) can be reliably avoided.

  Further, according to the present invention, by forming the drain hole 12 in the upper portion of the side plate 11, water accumulated in the quality evaluation instrument can be easily and reliably removed outside the instrument. When evaluating the evaluation target part, it is possible to reliably avoid an adverse effect on the evaluation by the liquid discriminating material remaining in the instrument.

  Also, according to the present invention, the cup 15 can be accurately applied to the first opening 2 of the front plate by providing the cup positioning ring 3 on the front plate 1, so that the water from the injection tool 14 can be drained. It can be accurately sprayed on the surface (S) of the evaluation target part.

  Moreover, according to this invention, by forming the corner part of the front plate 1 and the side plate 11 of the quality evaluation device into a curved surface shape, it is easy to hold the device, feel good, and operate easily. In addition, the water in the instrument can be easily wiped off.

  Further, according to the present invention, the measurement position can be accurately marked by providing the back plate 4 with the marking portion 16 in which the plurality of holes 16a into which the writing instrument is inserted is formed.

1: Front plate 2: First opening 3: Positioning ring 4: Back plate 5: Second opening 6: Upper opening 6a: Upper edge 6b: Lower edge 7: Lower opening 7a: Upper edge 7b: Lower edge 8: Guide means 9: Guide means for discharge 10: Guide means for holding 11: Side plate 12: Drain hole 13: Leg part 14: Injection tool 15: Cup 16: Marking part 16a: Hole 17: Detector

Claims (12)

Applying a liquid identification material to the surface of the evaluation target portion of the porous material by jetting, grasping the application status of the liquid identification material until the liquid identification material flows out without being absorbed by the porous material, and the application status In the device for evaluating the quality of the porous material used in determining the quality of the porous material based on
A circular ring-shaped front plate formed with a first opening, a circular back plate formed with a second opening, and a cylindrical side that connects the front plate and the back plate in parallel at an interval. A plurality of legs that form a gap between the back plate and the surface of the evaluation target part, provided on the outer surface of the evaluation target part of the back plate, the face plate; The second opening is formed by dividing the upper opening into two upper and lower stages, and the lower edge of the upper opening and the upper edge of the lower opening are both formed in a downwardly convex arc shape, and the inner surface of the back plate The guide means for guiding the flow of the liquid identification material attached to the inner surface of the back plate is formed, and the first opening is attached to an injection tool that restricts the injection region of the liquid identification material. A device for evaluating the quality of a porous material, characterized in that a cup is applied.   The application status includes the number of repeated application of the liquid identification material, the flow start time as the elapsed time from the application of the liquid identification material until the liquid identification material flows out without being absorbed, and the porous material applied with the liquid identification material The liquid discriminating material absorption state on the surface of the material, or the flow distance of the liquid discriminating material between the lower edge of the upper stage opening and the upper edge of the lower stage opening, Item 2. A device for evaluating the quality of a porous material according to Item 1.   The guide means comprises discharge guide means formed in an upwardly convex arc shape on the inner surface of the back plate, and the discharge guide means adheres to the inner surface of the back plate. 3. The porous material according to claim 1, wherein the flow is guided and discharged out of the second opening, thus preventing the liquid identification material from flowing into the second opening. 4. Equipment for quality evaluation of quality materials.   The discharge guide means is formed on the back plate at the upper edge portion of the upper stage opening, and on the back plate between the upper stage opening and the lower stage opening. A device for quality evaluation of a porous material as described.   The guide means includes holding guide means formed in a downwardly convex arc shape on the inner surface of the back plate, and the holding guide means holds the liquid identification material, and thus the liquid identification. The device for evaluating the quality of a porous material according to claim 1 or 2, wherein the material is prevented from flowing into the second opening.   The porous material quality evaluation instrument according to claim 5, wherein the holding guide means is formed on the back plate of the upper edge portion of the lower opening.   The quality evaluation instrument for a porous material according to any one of claims 1 to 6, wherein the guide means comprises a protrusion.   The quality evaluation instrument for a porous material according to any one of claims 1 to 6, wherein the guide means includes a groove.   The device for evaluating the quality of a porous material according to any one of claims 1 to 8, wherein a drain hole is formed in an upper portion of the side plate.   The quality evaluation instrument for a porous material according to any one of claims 1 to 9, wherein a positioning ring of the cup is provided on a front surface of the front plate.   The device for evaluating the quality of a porous material according to any one of claims 1 to 10, wherein a corner portion of the front plate and the side plate is formed in a curved shape.   The porous plate according to any one of claims 1 to 11, wherein the back plate is provided with a marking portion in which a plurality of holes into which a tip of a writing instrument is inserted are formed. Equipment for quality evaluation of materials.

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